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Heil AMT tweets PS4a specs, etc. for DIY

Posted on May 17, 2012 at 22:30:36
Posts: 68
Location: extreme N. Cal.
Joined: December 28, 2011
I have a couple of these tweeeters that I bought on eBay a couple of years ago. I want to use them in some high efficiancy (I think) speakers that I plan to build to work with some low power (SET, Gainclone) kit amps with which I want to start experimenting (O.K., playiing).

I saw them in an ad stating they're from PS4As. I think I recall also seeing others in an ad stating they were from PS8s, but I wouldn't bet my dogs on it (likr those dogs a lot).

They're the ones with those big, flush-mount, cast meta frames, painted silver, and are about 2.5' x 4.5' (very approximate).

It would be good to know the nominal impedance and frequency range. In a pinch, I can estimate the former by taking a static reading from a multimeter, but I'd rather have the factory stated specs for both to figure a crossover.

Oh, yeah, and efficiancy, so Ill know whether I'm totally barking up the wrong tree using them for speakers to use with SET amps.

If anyone has experiance in using these DIY, I'd love to hear about it--xover and driver pairing successes and failures, etc.

Thanks in advance for any info, tips, warnings, "naah-na-na-na-naah-nah, you shouldn't have bought those dogs", whatever.

Dave Osborne


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RE: Heil AMT tweets PS4a specs, etc. for DIY, posted on May 18, 2012 at 07:37:47

Posts: 1685
Joined: March 8, 2002
I know the big ones they sell through PE are 4 ohm. Most likely your are too. The big ones are rated at 92db/w. The smaller ones are probably less, making a SET amp usable only for small scale stuff. If you want the coloration of a SET amp, I would recommend bi-amping, using a gainclone for bass, and the SET for the high end. That would give you more dynamic range, among other benefits.


RE: Heil AMT tweets PS4a specs, etc. for DIY, posted on May 18, 2012 at 08:36:33
Industry Professional

Posts: 9260
Location: So. Cal.
Joined: February 9, 2002
"If you want the coloration of a SET amp"

I'm interested in what type of "coloration" you prefer to listen to?

Have Fun and Enjoy the Music
"Still Working the Problem"


AMTs are purely resistive, posted on May 19, 2012 at 17:38:56
Posts: 109
Location: North Carolina
Joined: July 7, 2005
So what you read on your DMM will pretty much be what they are through out their whole range.


True in practice, posted on May 21, 2012 at 13:37:48

Posts: 8792
Location: Tustin, CA (Orange County)
Joined: March 10, 2001
But strictly speaking, they show an Fs peak like a cone transducer and a small amount of inductive rise. These are dramatically suppressed relative to how they'd be in a cone system though, and it's accurate that you can treat them as a resistive value.

Bass is supposed to sound big. 6.5" is not a woofer size.


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